What is the charge of an iron(III) ion?
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How do you determine this, and also, how do you express the charge numerically (e.g., +1)?
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Answer:
The (III) in the middle is 3 in roman numerals. That number tells you the charge of the element listed before it. So, iron (III) has a 3+ charge. You know it is + because it is of the metal (the first element listed in an ionic compound).
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Other answers
The charge of iron III is expressed numerically as +3. We can find it's oxidation state when it is in the form of it's compound's for ex take feric oxide....... Two irons and three oxigens will make it the oxidation state of O is -2. To make this compound neutral iron should take +3 oxidation state so (2x+3)+(3x-2)=0.
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